Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb narrow_down

2 senses of narrow down

Sense 1
pin down, peg down, nail down, narrow down, narrow, specify -- (define clearly; "I cannot narrow down the rules for this game")
       => determine -- (fix in scope; fix the boundaries of; "the tree determines the border of the property")

Sense 2
specialize, specialise, narrow, narrow down -- (become more focus on an area of activity or field of study; "She specializes in Near Eastern history")
       => change, alter, vary -- (become different in some particular way, without permanently losing one's or its former characteristics or essence; "her mood changes in accordance with the weather"; "The supermarket's selection of vegetables varies according to the season")